Method of refrigerator manufacture



Jan. 26 1926.

L. G. coPEMAN HBTHOD oF REFRIGERATOR mumc'ung Filed Aprile, 1925 Y 3sneets$hetz` NVEYTOR.

ATTORNEY.

Jan. 26 1926.

l.. G. COF'EMAN` METHOD or RE'FRIGERATOR MAnUFAcTUnz Filed Apri; 6,'1925 l INVENTOR. fg/d? 59m/rafa A Patented Jan. 26,1926. l

UNI-TED STATES 1,510,017 ina'rsiai"v .oF-FICE.

LLOYD G. COPEMAN,OF FLINT, MICHIGAN.v

'METHOD or REFRIGRATOR MANUFACTURE.

Application sie@ .April e, 1925'. seriai- No. 21,002.

To all wliim z'zf may concern.; Be it known that I, LLOYD G. CorniirAN,.a citizen of the United States, residing lat Flint, in the county of-Genesee and State o f- Michigan, have invented certain new and usefulImprovements in Methods-ofRefrig- I' erator Manufacture, of which thefollowing be, manufactured by is a specification. Y

vThis invention relates to a` method of re` 'frigerator manufacture andhas for its object. "means for mouldinga complete composite refrigeratorshell with one set of mould sec# Obviously other articles-as well couldthe same method. In constructing any refrigerator with a tions.

vcompositeshell, whether the shell is coml -iposedv of two kinds ofinouldable material I finishing coat, -it'is necessary to use two' com'plete sets of moulds' as the refrigerator core or a material mouldedover a wood core, it

necessitates considerable work. In. ,coating a refrigerator core withartificial stone or ya must kbe first moulded and then placed intoanother set.of moulds so,that the layer of artificial stone'` whichcovers-the core may bev moulded. or cast thereon.

In the drawings: I

Fig. 1 isa'v-iew showing themould in sectionJ and the means for`separating the mould section so that -the .same may be sprayed with arelatively thin outer layer of stone or other finishing material.

Fig. 2 is a'vertical sectional, view showving the mould sections drawntogethery in readiness for pouring the 4refrigerator core.

' Fig. 3 is a similar view-showing the refrigerator core poured. intothe moulds.

Fig. 41s a perspective view of the completed refrigerator with parts-broken away to show the compositecliaracter of the shell.

a designates the sidewalls of the .outer mould, which are secured to thebottom mould section b, provided with the openings 0in which the-inner.mould sections or cores d are fitted when the same are drawnfor fitted'together. These inner mould sections or cores are supported on theplunger e which works in the cylinder f; compressed air or hydraulicpressure may be exerted on the end ofthe plunger for raising the same toany heightv desired, it being necessary that these-"cores be raised tosucha height that the operator can spray the insidelof the outer mouldsection with a spray gun g. It wouldbeimpossible to spray the matricesof the mould sections were it not forv the fact that the same can besprayed and then drawn together and correctly positioned with respecttopeach other, without necessitating an-adjustment every time the mouldsections are separated. 1 l".

The first step in the method 'is the coating .of the matrices ofthemould sections with an Oxy-.chloride cement composition. coatingforms anouter layer la, of cement which when hardened forms a very goodvThisartificial stone. This composition is pref' i Verablycomposed ofzumixture of magnesium oxide 25%, (silica),- 50% and sand25%, allpercentages calculated by'. weight. To this. dry mix 4'is addedsufficient magnesium chloride in solution "of 26 B. gravity, to

spraygun. I'preferably spray this material-.on the mouldsections as itis `the mostl convenient and practical Way in which to coat the same,but 4obviously this 'material' could becoated on the matrices of themould sections in other Ways ifdesirable. Obvi ously a finishing coating'containing other materials could be used depending on theL article Aandthe use to which it is The'neXt step'inthe operation isp the dropping ofthe inner mou'ld sections or cores into position within: the outermould.Such a position is shown in Fig. 2 which shows the inner cores spacedvfrom the walls of ,make the niiXt-uresuitable for spraying in a theouter mould section, the surface of the mould sections carrying thisrelatively thin layer ofv artificial stone or finishing coat which mayor may not have completely hardeiied. This layer could be hardenedcompletely before the mould sections are fitted together, or it isprobable that after the artificial stone composition is sprayed on themoulds the'same will be immediately fitted together. The next ^step isthe pouring of a plastic 'filler in the space' between the moulds, whichwill completely fill the space,

as shown. in Fig. 3,. between the layers of.

`before the outer Oxy-chloride cement has hardened,.. and both theplastic filler and the outer finishing coat allowed to harden at thesame time, or the finishing coat may be first allowed to set and hardenbefore pouring the refrigerator core or filler.

In spraying the outer layer on the outer mould section, the insidesurface of the layer is preferably left rather rough. In other words, ithas an irregular contour, so that when the inner core is poured in itfills all the valleys in the 'irregular surface of the outer finishinglayer, thereby serving to key the inner core and outer layer4 together.

What I claim is:

1. A method of-making a refrigerator or other article of manufacture,which lcomprises the coating of the moulding surfaces of the outer andinner mould sections with a relatively thin layer of finishing material,

H andthe pouring of a plastic filler in said mould to form acomposite'shell structure.

2. A-method of making a refrigerator orr other. article of manufacture,which comprises the coating of the moulding surfaces of an outerandmnermould section with al relatively thin layerof Oxy-chloride cement,

l 'and the pouring of a plastic filler of heatinsulating material insaid mould between the layers of Oxy-chloride' cement to form acomposite heat-insulatin ,refrigerator shell.

3. The method of maing a refrigerator orl other articlev of manufacture,which comprises the spraying of the moulding surfaces of outer and innermould sections with a relatively thin layer of finishing material, andthe pouring of a plasti'c'filler of Aheat'-'insu lating material in saidmould between the 4. .A method of making a refrigerator or other articleof manufacture, which comprises the coating of themouldingvsurfaces ofan inner and outer mould section with a relatively thin coating offinishing material while said mould sections are separated, the

moving of one mould section with respect to the other to bring the sametogether oney within the other, and the pouring of a` p1as' tic fillerin said mould between the finishing coatings on the matrices -of themould sec, tions to form ai composite shell structure.

5. A method of makingl ak refrigerator or other article of manufacture,which comprises the coating of the moulding surfaces of an innerv andouter mould section with a relatively thin coating of finishing materialthe surface of whichhas an irregular contour, and the pouring of aplastic filler in said mould to forma composite shell structure, theplastic filler filling the crevices in the irregular surface of the'outer yfinishing coating and serving to keythe filler andl outerfinishing coating together.

6. A method of making a refrigerator or other article of manufacture,which c0mprises the coating of the' moulding surfaces of an inner andouter mould section with a relatively thin layer of artificial stone thecoating of a plurality of inner mould sections or cores with arelatively thin layer of artificial stone, the telescoping of said innercores within the outer mould and littin the same together, and themoulding of a p astic filler of heat-insulating material in said mouldand between the layers of stone j

